5d043799cd
After bumping libupnpp from version 0.15.1 to 0.15.2 compilation fails
for toolchains using GCC 4.7:
```
libupnpp/control/discovery.cxx: In constructor 'UPnPClient::UPnPDeviceDirectory::UPnPDeviceDirectory(time_t)':
libupnpp/control/discovery.cxx:338:5: error: 'yield' is not a member of 'std::this_thread'
```
Before version 0.15.2, libupnpp used sched_yield() which was replaced by
`std::this_thread::yield()` in the new version.
Looking at the `<thread>` header file of the PowerPC toolchain [1] from
the autobuilder shows that `yield()` is only enabled if
`_GLIBCXX_USE_SCHED_YIELD` is defined:
```
/// yield
inline void
yield() noexcept
{ __gthread_yield(); }
```
Note, that `__gthread_yield()` inlines to a call to `sched_yield()`:
```
static inline int
__gthread_yield (void)
{
return __gthrw_(sched_yield) ();
}
```
This macro is only defined if GCC was built with `--enable-libstdcxx-time`,
which is obviously not the case for the affected toolchains. For GCC 4.7 and
below this option defaults to no, which means `sched_yield()` is not enabled
though it is be available.
The issue was discussed on stackoverflow [2]. In GCC 4.9.0 the issue has
been fixed, by automatically enabling `sched_yield()` on platforms that are
known to support them.
Therefore, we update the dependency to GCC 4.9.
Fixes:
http://autobuild.buildroot.net/results/506/50670d8119b4fbd26585d3d9bd646adb1d904dbe/
http://autobuild.buildroot.net/results/8b0/8b021648a073bde25dd6936ed1ea1e39977bf89b/
http://autobuild.buildroot.net/results/b6d/b6d7437e1cf8cf0b3726395401ac4ebd9af2833b/
http://autobuild.buildroot.net/results/0bf/0bf84f61a72a65a75c5fd0a787680f483cfead26/
.. and more.
[1] http://autobuild.buildroot.org/toolchains/tarballs/powerpc-ctng_e500v2-linux-gnuspe.tar.xz
[2] https://stackoverflow.com/a/12961816
Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
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| configs | ||
| docs | ||
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| linux | ||
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| support | ||
| system | ||
| toolchain | ||
| .defconfig | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| .gitlab-ci.yml.in | ||
| CHANGES | ||
| Config.in | ||
| Config.in.legacy | ||
| COPYING | ||
| DEVELOPERS | ||
| Makefile | ||
| Makefile.legacy | ||
| README | ||
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on Freenode IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches